Key sectors in carbon footprint responsibility at the city level: a case study of Beijing

Purpose - This paper aims to identify key sectors in carbon footprint responsibility, an introduced concept depicting CO2 responsibilities allocated through the supply chain containing sectoral activities and interactions. In detail, various key sectors could be identified according to comparative advantages in trade, sectoral linkage and sectoral synergy within the supply chain. Design/methodology/approach - A semi-closed input-output model is used to make the household income-expenditure relationship endogenous through the supply chain where sectoral CO2 emissions are calculated, and the production-based responsibility (PR) principle is evaluated. Thus, according to "carbon footprint responsibility", modified hypothetical extraction method is applied to decompose sectoral CO2 in terms of comparative advantages in trade, sectoral linkage and synergy. Finally, key sectors are identified via sectoral shares and associated decompositions in carbon footprint responsibility. Findings - Compared to 2005, in 2012, the PR principle failed to track sectoral CO2 flow, and embodied CO2 in import and interprovincial export increased, with manufacturing contributing the most; manufacturing should take more carbon responsibilities in the internal linkage, and tertiary sectors in the net forward and backward linkage, with sectors enjoying low carbonization in the mixed linkage; inward net CO2 flows of manufacturing and service sectors were more complicated than their outward ones in terms of involved sectors and economic drivers; and residential effects on CO2 emissions of traditional sectors increased, urban effects remained larger than rural ones and manufacturing and tertiary sectors received the largest residential effects. Originality/value - The value of this paper is as follows: the household income-expenditure relationship got endogenous in intermediate supply and demand, corresponding to the rapid urbanization in megacities; key sectors were observed to change flexibly according to real sectoral activities and interaction; and the evaluation of the PR principle was completed ahead of using a certain CO2 accounting principle at the city level.